{"id":"CVE-2026-56159","aliases":["EUVD-2026-44234","GHSA-pq85-w7c4-j7x5"],"status":"published","title":"DHCP Server Service Remote Code Execution Vulnerability","description":"Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00974,"percentile":0.62353,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2026-07-14T17:09:14Z","modified":"2026-11-01T17:36:45Z","products":[{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows server 2012"},{"vendor":"microsoft","product":"windows server 2012 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012 r2"},{"vendor":"microsoft","product":"windows server 2012 r2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_10_1607"},{"vendor":"microsoft","product":"windows_10_1809"},{"vendor":"microsoft","product":"windows_server_2012"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56159","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56159"},{"url":"https://github.com/advisories/GHSA-pq85-w7c4-j7x5"}],"sources":{"cve":[{"id":"CVE-2026-56159","title":"DHCP Server Service Remote Code Execution Vulnerability","description":"Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:09:14.316Z","modified":"2026-11-01T17:36:45.995Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T13:36:51.6229Z"}],"euvd":[{"id":"EUVD-2026-44234","description":"Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:09:14Z","modified":"2026-11-01T17:36:45Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical"}],"updated_at":"2026-11-02T16:58:46.970263Z"}],"ghsa":[{"id":"GHSA-pq85-w7c4-j7x5","title":"Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code...","description":"Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T18:32:37Z","modified":"2026-07-14T18:32:43Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T15:09:30.715875Z"}],"nvd":[{"id":"CVE-2026-56159","description":"Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T18:18:22.797Z","modified":"2026-07-21T20:14:36.287Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:12:29.489525Z"}]}}